Hi,
I am having a problem with an LDO I bought from TME. It is supposed to be capable of 1.5A
but I cannot get it to supply more than 100mA. My input voltage is 4.2V and the output voltage
setup by a resistor divider at the ADJ pin of the LDO is 2.6V The resistor values are R1 = 892Ω,
R2 = 1040Ω and it outputs a stable 2.6V, which is what the ADJ pin formula gives as well.
The reference voltage is 1.21V as it is supposed to be.
https://www.analog.com/media/en/technical-documentation/data-sheets/1963fc.pdf
When I connect a load to its output, a 3W LED in this case, it outputs from 70mA up to 100mA and
the voltage drops down to 1.9V-2.0V Power supply is set with a current limit of 600mA. The LED
when connected to 2.6V directly from the power supply draws 650mA.
I have used low ESR output capacitors either a 10uF or 330uF 40mΩ, but nothing changes.
What am I doing wrong

Probably I am doing something stupid but I cannot find the cause.
Any help would be appreciated.
Thanks.